Control strategy and methods for continuous direct compression processes

Area of Science:

• Pharmaceutical Manufacturing
• Chemical Engineering
• Process Control

Background:

• Traditional batch manufacturing for tablets has limitations.
• Continuous manufacturing offers potential advantages in efficiency and quality.
• A specific control strategy is needed for continuous direct compression processes.

Purpose of the Study:

• To present a novel control strategy for tablet manufacturing via continuous direct compression.
• To identify critical control points specific to continuous manufacturing.
• To establish a foundation for implementing advanced process control in pharmaceutical production.

Main Methods:

• Collaboration between pharmaceutical industry experts, machine suppliers, academia, and regulatory authorities.
• Identification of component ratio and blended powder content as key control parameters.
• Application of the Residence Time Distribution (RTD) model for feeder control.

Main Results:

• The Loss in Weight (LIW) feeder control was identified as crucial for continuous manufacturing.
• The RTD model proved effective for setting control ranges and managing LIW feeders.
• A conceptual framework for process control using RTD was developed.

Conclusions:

• The proposed control strategy, centered on RTD modeling, is effective for continuous direct compression.
• This approach provides a robust foundation for adopting new control methods in pharmaceutical manufacturing.
• The findings are applicable to both Japanese and international markets.